Re: [PATCH] dma-buf/fence-array: Add flex array to struct dma_fence_array

[Kees Cook <keescook@chromium.org>]

On Sat, May 18, 2024 at 07:47:02PM +0200, Christophe JAILLET wrote:
> This is an effort to get rid of all multiplications from allocation
> functions in order to prevent integer overflows [1][2].
> 
> The "struct dma_fence_array" can be refactored to add a flex array in order
> to have the "callback structures allocated behind the array" be more
> explicit.
> 
> Do so:
>    - makes the code more readable and safer.
>    - allows using __counted_by() for additional checks
>    - avoids some pointer arithmetic in dma_fence_array_enable_signaling()
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
> Link: https://github.com/KSPP/linux/issues/160 [2]
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

Yes please! :)

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook